Park Tool CC-4.2 Bicycle Chain Wear Checker

I recently got into chain waxing (Silca) and use the CC-4.2 to make sure my chain isn't getting "stretched" (there is no chain stretch, only chain wear). Staying on top of chain wear will extend the life of my cassettes and save me money. This is a simpler, cheaper and more accurate tool than Park's more sophisticated (looking) CC-2 chain checker. The CC-2 looks like it would be more dynamic, but typically falsely says a chain is worn if the pins become deflected too far. My bike shop uses a CC-2 and replaced my chain prematurely for no reason except that the CC-2 is recognized as a bad chain checker. Save yourself some money and replace chains at an appropriate wear level (not prematurely) with this tool!

Simple and does the job well.

Great tool. Price is high, but you get what you pay for.

works as advertised -- a bit pricey, but saves $$ in the long run when the bike shop says that my chain is 3/4 worn, and this tool disagrees

Easy to use and check the chain for wear.

Awesome product!

This is one of Park's few remaining tools that's still made in the US. It's easy to use and said to be more accurate than other chain checkers Park sells because it isolates roller wear from pin wear (it's pin wear you care about when checking for chain stretch). It's solidly made and should easily last for decades.

works great, very easy to use

Solid piece of equipment and accurate. Bit pricey.

The Park Tool CC-4.2 is an affordable, practical tool that belongs in every cyclist's toolbox. Because high-end bike components are expensive to replace, investing in proper maintenance tools is essential. The tool is easy to use and has no obvious downsides. With so many high-end components on the market—such as the SRAM XG-1299 XX1 Eagle Cassette 12-Speed ($668.80), SRAM XX1 Eagle Chain 12-Speed, 126 Links, Copper (various colours) ($124.90), SRAM X01 Eagle Dub C3 Crankset, Speed: 11/12 ($549.00 – $847.70)—the importance of proper chain maintenance becomes clear. These components are prime examples of costly bike parts that can be protected through timely chain maintenance. Investing $36.08 in the Park Tool CC-4.2 Bicycle Chain Wear Checker can prevent premature wear and save you significant costs in the long run. When compared to other chain checkers on the market—including models from SRAM, KMC, Wippermann, and Shimano—the Park Tool CC-4.2 offers greater compatibility and fewer limitations. Pros: Ease of use Cons: None that I can see at the moment

Semplice da usare ma estremamente utile!

Eine der wenigen Kettenlehren, die 12-Gang Ketten korrekt misst. Da man sich bei einer Längung über 0,5% schnell den gesamten Antrieb ruiniert, ist es bei den teuren 12-Gang Kassetten umso wichtiger, die Kette rechtzeitig auszutauschen. Beim Messen auf die Anleitung achten: die zwei enger beieinanderliegenden Nasen unbedingt bei den Innenlaschen der Kette einfädeln, und mit dem Daumen von unten leichten Druck auf die Kette ausüben (siehe auf Fotos). Dann einfach am anderen Ende ablesen, in welche Stufe die Kettenlehre in die Kette fällt. Ps: wiederholt zur Sicherheit die Messung an einem anderen Punkt, da sich Ketten ungleichmäßig längen können. Achtet weiters darauf, dass das Kettenschloss nicht Teil des gemessenen Kettenabschnitts ist. In meinem Fall geht die erste Stufe der Lehre hinein. Meine Kette ist somit 0,5% gelängt, und muss gewechselt werden, um Folgeschäden zu vermeiden. Fazit: Die ParkTool CC-4.2 Kettenlehre ist recht teuer und nicht ganz intuitiv in der Anwendung, aber angesichts der hohen Ersatzteilpreise eine notwendige Investition.

Funciona perfectamente. Ojo que algunas pegatinas son incorrectas y ponen “> 0.50” cuando es justamente al revés.